Danny Penman and Mark Williams discuss mindfulness of feeling tones (i.e., vedana) in a blog post on the website associated with their book Mindfulness: Finding Peace in a Frantic World. They describe the nature of feeling tones and describe some ways to meditate with them. They also discuss the way in which mindfulness of feeling tone can help us be more responsive and less reactive as we move through daily life. You can find their article here: What is Vedana?
Sara-Mai Conway has a good article that defines and examines the feeling tones (i.e., vedana) and talks about the relationship between learning to practice mindfulness of feeling tones and freedom. You can find her article here: How we Benefit from Mindfulness of Feeling tones